Is there any plan for translating the subtitles from MoodleHQ youtube videos into other languages? I started to translate some of the subtitles to brazilian portuguese, and was wondering if I could contribute back to the project.

Community members are very welcome to translate the subtitles of Moodle HQ videos. I understand a site such as https://amara.org/en/ works well for this purpose. I use the .sbv format for the subtitles. Feel free to try one as a test and email it to me and we can ensure it works.

From what I read in Amara (http://about.amara.org/youtube-crowd-subtitles/), the owner of the channel must enable the contributions first, so others can collaborate. I also saw that there is an option within youtube itself to collaborate, using the communities options, that uses youtube's own subtitle editor and subtitle importer. I don't know whichever is easier for you guys, because I'm still testing what is the best workflow to do this work, but if any of these options are available, I will get right on into contributing to it.

By the way, this is the first one that we have already translated, using a more or less complex workflow (youtube-dl to download subtitles, aegisub to edit them, and upload it to youtube manually):

And, would anyone know whether the audio there can be easily translated also?

You could use audacity to make a new audio layer and put it over the original one with any decent video editor. But unfortunatelly, I don't think that youtube uses multiple audio channels at this time, so each video will have to be uploaded individually.

Maybe I'll try to do this with one the videos to see if this is a good worflow.

Hello again. When I have tried https://www.amara.org I simply logged in, pasted the URL of the Youtube video I wanted to subtitle, added the subtitles in my different language and then once saved, they could be downloaded in different formats including .sbv .

So I had imagined this would be how you would translate the HQ videos, and I would then upload the subtitle files the appropriate video.

I haven't explored the crowd-subtitling which you linked to. I haven't seen aegishub either, and it does look interesting.